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README: add scan-mode 2 and expand descriptions of modes 0 and 1

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Signed-off-by: Zygo Blaxell <bees@furryterror.org>
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Zygo Blaxell 2018-01-28 01:56:43 -05:00
parent 636328fdc2
commit 27125b8140
1 changed files with 6 additions and 1 deletions
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README.md
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@ -506,7 +506,12 @@ Command Line Options
* Specify extent scanning algorithm. Default mode is 0.
_EXPERIMENTAL_ feature that may go away.
* Mode 0: scan extents in ascending order of (inode, subvol, offset).
* Mode 1: scan extents in round-robin order from each subvol.
Keeps shared extents between snapshots together. Reads files sequentially.
Minimizes temporary space usage.
* Mode 1: scan extents from all subvols in parallel. Good performance
on non-spinning media when subvols are unrelated.
* Mode 2: scan all extents from one subvol at a time. Good sequential
read performance for spinning media. Maximizes temporary space usage.
* --timestamps (-t)
* Enable timestamps in log output.
* --notimestamps (-T)